如何使用Java在Google Cloud Storage中插入pdf文件
如何使用Java在Google Cloud Storage中插入pdf文件
提问于 2018-08-06 23:10:42
我已经尝试上传一个pdf文件到谷歌云存储使用我的应用程序，但我无法这样做。我已经搜索网络，并找到以下给定的代码，但问题是，这个代码是有用的上传txt文件，但不是pdf file.When我尝试上传它上传成功，但当我试图打开它没有打开它。我使用以下代码：
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
RequestDispatcher rd=req.getRequestDispatcher("career-registration-successfull.jsp");
RequestDispatcher rd1=req.getRequestDispatcher("career-registration-failed.jsp");
String name="";
String email="";
long whatsapp=0;
long number=0;
String query="";
int flag1=0;
int flag2=0;
isMultipart = ServletFileUpload.isMultipartContent(req);
resp.setContentType("text/html");
java.io.PrintWriter out = resp.getWriter( );
FileInputStream fileInputStream = new FileInputStream("C:\\Users\\Subhanshu Bigasia\\Desktop\\Amazon.pdf");
Storage storage = StorageOptions.getDefaultInstance().getService();
Bucket bucket=storage.get(("combucket1eduvitae7"));
ServletFileUpload sfu = new ServletFileUpload(new DiskFileItemFactory());
String targetFileStr="";
try {
List<FileItem> fileName = sfu.parseRequest(req);
for(FileItem f:fileName)
{
try {
f.write (new File("C:\\Users\\Subhanshu Bigasia\\Desktop\\Afcat.pdf"));
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//targetFileStr = readFile("/Users/tkmajdt/Documents/workspace/File1POC1/" + f.getName(),Charset.defaultCharset());
targetFileStr = new String(Files.readAllBytes(Paths.get("C:\\Users\\Subhanshu Bigasia\\Desktop\\Afcat.pdf")));
}
}
catch(Exception e) {
e.printStackTrace();
}
BlobId blobId = BlobId.of("combucket1eduvitae", "my_blob_name1");
//Blob blob = bucket.create("my_blob_name1", targetFileStr.getBytes(), "text/plain");
Blob blob=bucket.create("myblob",fileInputStream, "text");有人能帮忙解决这个问题吗？
提前谢谢你
回答 2
Stack Overflow用户
回答已采纳
发布于 2018-08-08 04:24:37
我用下面的代码解决了这个问题：
String name="";
String email="";
long whatsapp=0;
long number=0;
String query="";
int flag1=0;
int flag2=0;
boolean isMultipart = ServletFileUpload.isMultipartContent(req);
resp.setContentType("text/html");
java.io.PrintWriter out = resp.getWriter( );
if( !isMultipart ) {
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet upload</title>");
out.println("</head>");
out.println("<body>");
out.println("<p>No file uploaded</p>");
out.println("</body>");
out.println("</html>");
return;
}
DiskFileItemFactory factory = new DiskFileItemFactory();
// maximum size that will be stored in memory
factory.setSizeThreshold(maxMemSize);
// Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload(factory);
// maximum file size to be uploaded.
upload.setSizeMax( maxFileSize );
try {
// Parse the request to get file items.
List fileItems = upload.parseRequest(req);
// Process the uploaded file items
Iterator i = fileItems.iterator();
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet upload</title>");
out.println("</head>");
out.println("<body>");
while ( i.hasNext () ) {
FileItem fi = (FileItem)i.next();
if ( !fi.isFormField () ) {
// Get the uploaded file parameters
try { String fieldName = fi.getFieldName();
String fileName = fi.getName();
String contentType = fi.getContentType();
boolean isInMemory = fi.isInMemory();
long sizeInBytes = fi.getSize();
Date date=new Date();
System.out.println(("Uploaded Filename: " + fileName + "<br>"));
flag1=1;
File f1=new File("C:\\Users\\Subhanshu Bigasia\\Desktop\\amazon2.pdf");
FileInputStream fileInputStream = (FileInputStream) fi.getInputStream();
Storage storage = StorageOptions.getDefaultInstance().getService();
Bucket bucket=storage.get(("combucket1eduvitae7"));
ServletFileUpload sfu = new ServletFileUpload(new DiskFileItemFactory());
BlobId blobId = BlobId.of("combucket1eduvitae", "my_blob_name1");
//Blob blob = bucket.create("my_blob_name1", targetFileStr.getBytes(), "application/pdf");
Blob blob=bucket.create(fileName+" "+date.toString(),fileInputStream,"application/pdf");
flag1=1;
}
catch(Exception e) {
flag1=0;
e.printStackTrace();
}
}请注意，我使用了
Blob blob=bucket.create(fileName+“"+date.toString()，fileInputStream，”应用程序/pdf“)；而不是
Blob blob=bucket.create(fileName+“"+date.toString()，fileInputStream，”文本/纯文本“)；
Stack Overflow用户
发布于 2018-08-07 19:12:38
首先，遵循Cloud Storage Client Libraries for Java documentation，它将帮助您开始。
然后您可以尝试使用Java (found here)将文件上传到云存储存储桶中：
/**
* Uploads data to an object in a bucket.
*
* @param name the name of the destination object.
* @param contentType the MIME type of the data.
* @param file the file to upload.
* @param bucketName the name of the bucket to create the object in.
*/
public static void uploadFile(
String name, String contentType, File file, String bucketName)
throws IOException, GeneralSecurityException {
InputStreamContent contentStream = new InputStreamContent(
contentType, new FileInputStream(file));
// Setting the length improves upload performance
contentStream.setLength(file.length());
StorageObject objectMetadata = new StorageObject()
// Set the destination object name
.setName(name)
// Set the access control list to publicly read-only
.setAcl(Arrays.asList(
new ObjectAccessControl().setEntity("allUsers").setRole("READER")));
// Do the insert
Storage client = StorageFactory.getService();
Storage.Objects.Insert insertRequest = client.objects().insert(
bucketName, objectMetadata, contentStream);
insertRequest.execute();
}您可以在GitHub存储库here中找到简单的入门教程。请同时查看堆栈溢出线程Upload image to Google Cloud Storage (Java)。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/51710723
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